Income tax dedution on army pension

Last week I posted my query regarding Tax Deduction on Army Pension.My Father is getting Rs-45090/-Per Month as pension.In the Feb.Month Pension Bank Deducted Rs-8957/- as TDS and Rs-36134/- was credited in Account.My query is :- 1) What should be the rate of Tax to be deducted by Bank? 2)What is the Current Tax Slab & will it be changed from April if yes than what it will be?